U.S. patent application number 17/034330 was filed with the patent office on 2021-05-06 for electronic shift lever.
The applicant listed for this patent is HYUNDAI KEFICO CORPORATION. Invention is credited to Su Won Kim, Jae Yu Ko, Chan Woo Lee, Ji Hwan Oh.
Application Number | 20210131555 17/034330 |
Document ID | / |
Family ID | 1000005153468 |
Filed Date | 2021-05-06 |
United States Patent
Application |
20210131555 |
Kind Code |
A1 |
Ko; Jae Yu ; et al. |
May 6, 2021 |
ELECTRONIC SHIFT LEVER
Abstract
An electronic shift lever is provided and includes a housing
which accommodates various components therein. A motor unit
generates a driving force and a reduction unit is connected to the
motor unit. The reduction unit is configured to increase the
driving force generated from the motor unit. The motor unit and the
reduction unit are accommodated inside the housing and are formed
integrally with each other.
Inventors: |
Ko; Jae Yu; (Seoul, KR)
; Oh; Ji Hwan; (Seoul, KR) ; Kim; Su Won;
(Suwon, KR) ; Lee; Chan Woo; (Gunpo, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
HYUNDAI KEFICO CORPORATION |
Gunpo-si |
|
KR |
|
|
Family ID: |
1000005153468 |
Appl. No.: |
17/034330 |
Filed: |
September 28, 2020 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F16H 1/32 20130101; F16C
19/183 20130101; G01B 7/30 20130101; G01D 5/145 20130101; F16H
59/105 20130101; B60K 23/00 20130101 |
International
Class: |
F16H 59/10 20060101
F16H059/10; B60K 23/00 20060101 B60K023/00; F16H 1/32 20060101
F16H001/32; G01D 5/14 20060101 G01D005/14; G01B 7/30 20060101
G01B007/30; F16C 19/18 20060101 F16C019/18 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 30, 2019 |
KR |
10-2019-0136118 |
Claims
1. An electronic shift lever, comprising: a housing which
accommodates various components therein; a motor unit configured to
generate a driving force; a reduction unit connected to the motor
unit and configured to increase the driving force generated from
the motor unit; and a printed circuit board (PCB) disposed on the
motor unit and to which a Hall sensor is attached, wherein the
motor unit and the reduction unit are accommodated inside the
housing and are formed integrally with each other.
2. The electronic shift lever of claim 1, wherein the motor unit
includes: a rotor core configured to generate the driving force; a
hollow shaft rotated by the driving force of the rotor core due to
the rotor core inserted to be disposed on an outer circumferential
surface of the hollow shaft; a sensing plate disposed between the
PCB and the reduction unit; and a sensor magnet attached to the
sensing plate and sensed by the Hall sensor of the PCB, wherein the
reduction unit includes an output shaft in which the hollow shaft
is inserted to be disposed on an outer circumferential surface
thereof, a bearing inserted between the hollow shaft and the output
shaft, and a gear portion connected to the hollow shaft and the
output shaft to deliver a driving force of the hollow shaft to the
output shaft, and wherein the sensing plate is coupled between one
end of the output shaft and one end of the hollow shaft.
3. The electronic shift lever of claim 2, wherein the hollow shaft
includes an eccentric portion formed on an outer circumferential
surface in a first end direction thereof and delivers the driving
force of the rotor core to the gear portion through the eccentric
portion.
4. The electronic shift lever of claim 3, wherein the gear portion
includes an inner gear inserted to be disposed on the eccentric
portion of the hollow shaft and an outer gear coupled to an outer
circumferential surface of the inner gear, and the outer gear and
the inner gear are coupled to each other in a cycloid gear
structure.
5. The electronic shift lever of claim 4, wherein a wing portion,
through which a coupling groove passes, is formed on an outer
circumferential surface of the output shaft, and a coupling
protrusion is formed to extend downward from a position of a lower
surface of the inner gear, which corresponds to the coupling
groove, and is inserted into the coupling groove.
6. The electronic shift lever of claim 2, wherein the sensing plate
includes: a plate portion which has a lower surface with which an
end of the hollow shaft in one direction is in contact and has an
upper surface to which the sensor magnet is attached; and an
insertion portion having a cylindrical shape which extends downward
from the plate portion.
7. The electronic shift lever of claim 6, wherein an outer
circumferential surface of the insertion portion is in contact with
an inner circumferential surface of the hollow shaft, and an inner
circumferential surface of the insertion portion is in contact with
an outer circumferential surface of the output shaft.
8. The electronic shift lever of claim 2, wherein the bearing
includes: a double-row bearing disposed between an outer
circumferential surface of the output shaft and an inner
circumferential surface of the hollow shaft; and a single-row
bearing disposed between an outer circumferential surface of the
hollow shaft and an inner circumferential surface of the gear
portion.
9. The electronic shift lever of claim 8, wherein the double-row
bearing includes two radial-type ball bearings which are rotatable
in response to external forces in axial, radial, and tangential
directions.
10. The electronic shift lever of claim 2, wherein the reduction
unit further includes: a reducer cover in which an outer gear is
assembled in a press-fitting manner; and a knurled surface formed
on a surface of the reducer cover on which the outer gear is
press-fitted.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] The application claims priority to Korean Patent Application
No. 10-2019-0136118 filed on Oct. 30, 2019, the entire contents of
which is incorporated herein for all purposes by this
reference.
BACKGROUND
1. Field of the Disclosure
[0002] The present disclosure relates to an electronic shift lever,
and more particularly, to an electronic shift lever in which a
gearshift in a target shift stage range may be automatically
operated within a shift range set according to a driving speed of a
vehicle.
2. Discussion of Related Art
[0003] In general, a vehicle equipped with an automatic
transmission allows a gearshift in a target shift range to be
automatically operated by adjusting hydraulic pressure within a
shift range set according to a driving speed of the vehicle. To
perform shifting, the automatic transmission sets up a gear ratio
using a hydraulic circuit, a planetary gear, and frictional
elements. A transmission control unit (TCU) operates such
components.
[0004] Meanwhile, unlike an existing mechanical shift system
operated through the existing mechanical mechanism, a shift-by-wire
(hereinafter, referred to as "SBW") system is a shift system in
which mechanism parts such as a cable, a mechanical manual valve,
and a mechanical parking mechanism are removed. The SBW system is a
system in which, when a lever sensor value generated during an
operation of an electronic shift lever or a button is transferred
to a TCU, a solenoid or an electric motor is operated by an
electronic signal instructed by the TCU, and then, by the operation
of the solenoid or the electric motor, oil pressure is applied to
or shut off from a hydraulic circuit for each shift stage, whereby
shift control may be electronically performed.
[0005] Therefore, an automatic transmission based on SBW delivers a
driver's intention of shifting in the form of an electric signal to
a TCU through a simple operation of an electronic shift lever or a
button. Accordingly, shifting into a driving range (D), a reverse
range (R), a neutral range (N), a parking range (P), and the like
is easily performed. In addition, the size of the shift lever may
be reduced to secure more space between a driver's seat and a
passenger's seat.
[0006] An automatic transmission based on the conventional SBW
includes a housing, a rotor core, a magnet yoke, and a sensor
magnet. The rotor core and the magnet yoke are accommodated inside
the housing, and the magnet yoke is assembled in a magnetized state
on an upper portion of the rotor core. The sensor magnet is
attached to the magnet yoke coupled to the upper portion of the
rotor core through a bonding method. A magnetic force is delivered
to a hall sensor positioned on a motor through the sensor
magnet.
[0007] Meanwhile, the rotor core and the magnet yoke may be
assembled in a mutually magnetized state, but for the rotor core
and the magnet yoke to be assembled more firmly, a aperture may be
formed in the upper portion of the rotor core to couple the magnet
yoke to the aperture. Therefore, an additional operation process
for forming the aperture in the upper portion of the rotor core is
required. In addition, since an unnecessary space is formed inside
the housing in addition to a space for installing the magnet yoke,
there is a high possibility that a packaging problem occurs due to
a full length of a product.
[0008] For the above-described reasons, in the related field, a
method of reducing an additional operation process and a size of an
automatic transmission is being sought, but until now, satisfactory
results have not been obtained.
SUMMARY
[0009] The present disclosure is directed to providing an
electronic shift lever which allows an additional operation process
and a size of an automatic transmission to be reduced.
[0010] According to an aspect of the present disclosure, an
electronic shift lever may include a housing which accommodates
various components therein, a motor unit configured to generate a
driving force, a reduction unit connected to the motor unit and
configured to increase the driving force generated from the motor
unit, and a printed circuit board (PCB) disposed on the motor unit
and to which a Hall sensor is attached, wherein the motor unit and
the reduction unit may be accommodated inside the housing and may
be formed integrally with each other.
[0011] The motor unit may include a rotor core configured to
generate the driving force, a hollow shaft rotated by the driving
force of the rotor core due to the rotor core inserted to be
disposed on an outer circumferential surface of the hollow shaft, a
sensing plate disposed between the PCB and the reduction unit, and
a sensor magnet attached to the sensing plate and sensed by the
Hall sensor of the PCB, the reduction unit may include an output
shaft in which the hollow shaft may be inserted to be disposed on
an outer circumferential surface thereof, a bearing inserted
between the hollow shaft and the output shaft, and a gear portion
connected to the hollow shaft and the output shaft to deliver a
driving force of the hollow shaft to the output shaft, and the
sensing plate may be coupled between one end of the output shaft
and one end of the hollow shaft.
[0012] The hollow shaft may include an eccentric portion formed on
an outer circumferential surface in the one end direction thereof
and may deliver the driving force of the rotor core to the gear
portion through the eccentric portion. The gear portion may include
an inner gear inserted to be disposed on the eccentric portion of
the hollow shaft and an outer gear coupled to an outer
circumferential surface of the inner gear, and the outer gear and
the inner gear may be coupled to each other in a cycloid gear
structure.
[0013] A wing portion, through which a coupling groove passes, may
be formed on an outer circumferential surface of the output shaft,
and a coupling protrusion may be formed to extend downward from a
position of a lower surface of the inner gear, which corresponds to
the coupling groove, and may be inserted into the coupling groove.
The sensing plate may include a plate portion which has a lower
surface with which an end of the hollow shaft in one direction is
in contact and has an upper surface to which the sensor magnet is
attached, and an insertion portion having a cylindrical shape which
extends downward from the plate portion.
[0014] An outer circumferential surface of the insertion portion
may be in contact with an inner circumferential surface of the
hollow shaft, and an inner circumferential surface of the insertion
portion may be in contact with an outer circumferential surface of
the output shaft. The bearing may include a double-row bearing
disposed between an outer circumferential surface of the output
shaft and an inner circumferential surface of the hollow shaft, and
a single-row bearing disposed between an outer circumferential
surface of the hollow shaft and an inner circumferential surface of
the gear portion.
[0015] The double-row bearing may include two radial-type ball
bearings which are rotatable in response to external forces in
axial, radial, and tangential directions. The reduction unit may
further include a reducer cover in which an outer gear is assembled
in a press-fitting manner, and a knurled surface may be formed on a
surface of the reducer cover on which the outer gear is
press-fitted.
BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The above and other objects, features and advantages of the
present disclosure will be more clearly understood from the
following detailed description taken in conjunction with the
accompanying drawings, in which:
[0017] FIG. 1 is a cross-sectional view illustrating a cross
section of an electronic shift lever according to one exemplary
embodiment of the present disclosure.
[0018] FIG. 2 is an exploded perspective view illustrating the
electronic shift lever according to one exemplary embodiment of the
present disclosure.
[0019] FIG. 3 is a cross-sectional view illustrating a coupling
structure of a sensing plate of the electronic shift lever
according to one exemplary embodiment of the present
disclosure.
[0020] FIG. 4 is a plan view illustrating a gear portion of the
electronic shift lever according to one exemplary embodiment of the
present disclosure.
[0021] FIG. 5 is an exploded perspective view illustrating the gear
portion and a reducer cover of the electronic shift lever according
to one exemplary embodiment of the present disclosure.
DETAILED DESCRIPTION
[0022] It is understood that the term "vehicle" or "vehicular" or
other similar term as used herein is inclusive of motor vehicles in
general such as passenger automobiles including sports utility
vehicles (SUV), buses, trucks, various commercial vehicles,
watercraft including a variety of boats and ships, aircraft, and
the like, and includes hybrid vehicles, electric vehicles,
combustion, plug-in hybrid electric vehicles, hydrogen-powered
vehicles and other alternative fuel vehicles (e.g. fuels derived
from resources other than petroleum).
[0023] It is understood that the term "vehicle" or "vehicular" or
other similar term as used herein is inclusive of motor vehicles in
general such as passenger automobiles including sports utility
vehicles (SUV), buses, trucks, various commercial vehicles,
watercraft including a variety of boats and ships, aircraft, and
the like, and includes hybrid vehicles, electric vehicles,
combustion, plug-in hybrid electric vehicles, hydrogen-powered
vehicles and other alternative fuel vehicles (e.g. fuels derived
from resources other than petroleum).
[0024] The terminology used herein is for the purpose of describing
particular embodiments only and is not intended to be limiting of
the disclosure. As used herein, the singular forms "a", "an" and
"the" are intended to include the plural forms as well, unless the
context clearly indicates otherwise. It will be further understood
that the terms "comprises" and/or "comprising," when used in this
specification, specify the presence of stated features, integers,
steps, operations, elements, and/or components, but do not preclude
the presence or addition of one or more other features, integers,
steps, operations, elements, components, and/or groups thereof. As
used herein, the term "and/or" includes any and all combinations of
one or more of the associated listed items.
[0025] Unless specifically stated or obvious from context, as used
herein, the term "about" is understood as within a range of normal
tolerance in the art, for example within 2 standard deviations of
the mean. "About" can be understood as within 10%, 9%, 8%, 7%, 6%,
5%, 4%, 3%, 2%, 1%, 0.5%, 0.1%, 0.05%, or 0.01% of the stated
value. Unless otherwise clear from the context, all numerical
values provided herein are modified by the term "about."
[0026] The advantages and features of the present disclosure and
methods for accomplishing the same will be more clearly understood
from exemplary embodiments described below with reference to the
accompanying drawings. However, the present disclosure is not
limited to the following exemplary embodiments but may be
implemented in various different forms.
[0027] Rather, the present exemplary embodiments will make the
disclosure of the present disclosure complete and allow those
skilled in the art to completely comprehend the scope of the
present disclosure. The present disclosure is only defined within
the scope of accompanying claims.
[0028] Terms used in this specification are to describe the
embodiments and are not intended to limit the present disclosure.
As used herein, singular expressions, unless defined otherwise in
contexts, include plural expressions. It will be further understood
that the terms "comprises," "comprising," "includes," and/or
"including," when used herein, specify the presence of stated
components, steps, operations, and/or elements, but do not preclude
the presence or addition of one or more other components, steps,
operations, and/or elements.
[0029] Hereinafter, exemplary embodiments of the present disclosure
will be described in detail with reference to the accompanying
drawings.
[0030] Referring to FIGS. 1 to 5, the electronic shift lever
according to one exemplary embodiment of the present disclosure may
include a housing 100, a printed circuit board (PCB) 200, a motor
unit 300, and a reduction unit 400. The housing 100 accommodates
various components such as the PCB 200, the motor unit 300, and the
reduction unit 400 and blocks foreign materials from being
introduced from the outside.
[0031] The housing 100 protects various components accommodated
therein from an external impact. The PCB 200 is disposed in one end
direction inside the housing 100, and at least one Hall sensor 210
is disposed therein. The Hall sensor 210 attached to the PCB 200
may be configured to sense a change in magnetic flux of a sensor
magnet 332 of the motor unit 300 to calculate a rotation angle of
the motor unit 300.
[0032] Meanwhile, when the Hall sensor 210 attached to the PCB 200
is able to sense the change in magnetic flux of the sensor magnet
332, the Hall sensor 210 may also include various sensors. The
motor unit 300 may be accommodated inside the housing 100, and a
driving force thereof may be generated according to an input signal
of a controller configured to receive an input signal from a user.
The motor unit 300 may include a rotor core 310, a hollow shaft
320, a sensing plate 330, and the sensor magnet 332. The rotor core
310 may be configured to generate the driving force in the motor
unit 300 and has an aperture 311 formed to pass through a first end
and a second end thereof. The hollow shaft 320 passes through the
aperture 311.
[0033] Meanwhile, the rotor core 310 according to one exemplary
embodiment of the present disclosure may be a brushless direct
current (BLDC) motor or a switched reluctance (SR) motor. The rotor
core 310 may be inserted to be disposed on an outer circumferential
surface of the hollow shaft 320, and thus, the hollow shaft 320 may
be rotated by the driving force of the rotor core 310. The first
end and the second end of an inside of the hollow shaft 320
communicate with each other.
[0034] An eccentric portion 321 may be formed in the hollow shaft
320. The eccentric portion 321 may be formed on the outer
circumferential surface in the second end direction of the hollow
shaft 320 and allows the driving force of the rotor core 310 to be
delivered to a gear portion 430. The eccentric portion 321
protrudes from the outer circumferential surface in the second end
direction of the hollow shaft 320, and when the hollow shaft 320
may be rotated by the rotation of the rotor core 310, the eccentric
portion 321 presses the gear portion 430.
[0035] The sensing plate 330 may be disposed under the PCB 200 and
may be disposed at a first end of the hollow shaft 320. In other
words, the sensing plate 330 may be disposed between the PCB 200
and the hollow shaft 320. The sensing plate 330 may be coupled
between one end (e.g., a first end) of the hollow shaft 320 and one
end (e.g., a first end) of an output shaft 410 of the reduction
unit 400. The sensing plate 330 may include a plate portion 331 and
an insertion portion 333.
[0036] One end of the hollow shaft 320 is in contact with a lower
surface of the plate portion 331, and the sensor magnet 332, of
which a magnetic force is sensed by the Hall sensor 210 attached to
the PCB 200, may be attached onto an upper surface of the plate
portion 331. The plate portion 331 may be formed to be thick, may
have an outer diameter greater than an outer diameter of the hollow
shaft 320, and may have an area smaller than an area of the PCB
200. In particular, the plate portion 331 may be disposed adjacent
to the PCB 200.
[0037] The Hall sensor 210 attached to the PCB 200 may be disposed
in a region that overlaps the plate portion 331. Thus, the Hall
sensor 210 may be configured to sense the change in magnetic flux
of the sensor magnet 332 attached to the plate portion 331 to
calculate the rotation angle of the motor unit 300. In addition,
the plate portion 331 and the
[0038] PCB 200 may be disposed adjacent to each other, and thus,
the Hall sensor 210 attached to the PCB 200 may have a relatively
high detection power with respect to the sensor magnet 332 to
accurately sense the sensor magnet 332. In addition, the sensor
magnet 332 having low magnetism may be selectively used according
to a use environment to lower costs of the sensor magnet 332.
[0039] Furthermore, since the plate portion 331 may be formed to be
thick, the housing 100 may be formed to have a small size, thereby
making the electronic shift lever compact. The insertion portion
333 may be formed to have a cylindrical shape and extend downward
from the lower surface of the plate portion 331. The insertion
portion 333 may have a cross-sectional shape that corresponds to
cross-sectional shapes of the hollow shaft 320 and the output shaft
410 of the reduction unit 400. As shown in FIG. 3, the insertion
portion 333 may be inserted between the hollow shaft 320 and the
output shaft 410. Thus, the insertion portion 333 prevents the
sensing plate 330 from being separated from the hollow shaft 320
and the output shaft 410.
[0040] The reduction unit 400 may be connected to the motor unit
300 to increase the driving force generated from the motor unit
300, specifically, the rotor core 310, and may include the output
shaft 410, a bearing, and the gear portion 430. The hollow shaft
320 may be inserted to be disposed on an outer circumferential
surface of the output shaft 410, and a lower portion of the output
shaft 410 may be connected to a detent lever (not shown) which
changes parking (P), reverse (R), neutral (N), and driving (D)
stages of a transmission according to an input signal of the
controller.
[0041] In other words, when the driving force generated in the
rotor core 310 may be delivered to the output shaft 410 through the
gear portion 430 according to the rotation of the hollow shaft 320,
the output shaft 410 may be rotated to deliver the driving force of
the rotor core 310 to the detent lever. Therefore, the output shaft
410 may be configured to rotate the detent lever by a specific
position according to the driving force to change the P, R, N, and
D stages of the transmission.
[0042] In addition, the output shaft 410 may have an outer diameter
that is less than an inner diameter of the hollow shaft 320.
Accordingly, the outer circumferential surface of the output shaft
410 may be spaced apart from an inner circumferential surface of
the hollow shaft 320 by a certain distance, and as shown in FIG. 3,
the insertion portion 333 may be fitted between one end direction
(e.g., a first end direction) of the output shaft 410 and one end
direction (e.g., a first end direction) of the hollow shaft 320 in
a forcible fitting manner.
[0043] In other words, an inner circumferential surface of the
insertion portion 333 is in contact with the outer circumferential
surface of the output shaft 410, and an outer circumferential
surface thereof is in contact with the inner circumferential
surface of the hollow shaft 320. Due to such a coupling structure,
the sensing plate 330 may be stably prevented from being separated
from the hollow shaft 320 and the output shaft 410 by a vibration
of the rotor core 310 or an external force applied from the
outside.
[0044] The bearing may be inserted between the hollow shaft 320 and
the output shaft 410. When the gear portion 430 is rotated by the
driving force of the rotor core 310, the bearing allows the gear
portion 430 to be rotated more easily from the housing 100. In
particular, due to the bearing, the gear portion 430 allows the
hollow shaft 320 and the output shaft 410 to be strongly supported
by the housing 100.
[0045] Additionally, the bearing may include a double-row bearing
421 and a single-row bearing 422. The double-row bearing 421 may be
disposed between the outer circumferential surface of the output
shaft 410 and the inner circumferential surface of the hollow shaft
320 and supports both of the hollow shaft 320 and the output shaft
410. Thus, when the rotor core 310 is operated, the double-row
bearing 421 minimizes the shaking of the hollow shaft 320 and the
output shaft 410, thereby securing robustness of the hollow shaft
320 and the output shaft 410.
[0046] The double-row bearing 421 may include two radial-type ball
bearings which are rotatable in response to external forces in
axial, radial, and tangential directions. The single-row bearing
422 may be disposed between an outer circumferential surface of the
hollow shaft 320 and an inner circumferential surface of the gear
portion 430 and supports the hollow shaft 320 and the gear portion
430 together. Thus, when the rotor core 310 is operated, the
single-row bearing 422 minimizes the shaking of the hollow shaft
320 and the gear portion 430, thereby securing robustness of the
hollow shaft 320 and the gear portion 430.
[0047] The gear portion 430 may be connected to the hollow shaft
320 and the output shaft 410 to deliver the driving force of the
rotor core 310 to the output shaft 410 and may be selectively
rotated by the driving force of the rotor core 310, which is
generated according to an input signal of the controller. The gear
portion 430 may include an inner gear 431 and an outer gear 433.
The inner gear 431 may be inserted to be disposed in a region of
the eccentric portion 321 of the hollow shaft 320 and may be
rotated concurrently when the hollow shaft 320 is rotated by the
driving force of the rotor core 310.
[0048] The outer gear 433 may be disposed on an outer
circumferential surface of the inner gear 431 to be coupled to the
inner gear 431 and may be rotated together with the inner gear 431
when the hollow shaft 320 is rotated by the driving force of the
rotor core 310. The inner gear 431 and the outer gear 433 may
receive the driving force from the rotor core 310 and perform
deceleration to increase the driving force. An amount of increase
in the driving force may be determined according to a deceleration
ratio set by parameters such as a module, a pitch circle diameter
(PCD), and the number of teeth of the inner gear 431 and the outer
gear 433.
[0049] Meanwhile, the inner gear 431 and the outer gear 433 may be
coupled to each other in a cycloid gear structure. Accordingly, as
shown in FIG. 4, the inner gear 431 may be eccentrically assembled
with the outer gear 433, and a driving force may be delivered to
the output shaft 410 according to eccentricity. Meanwhile, a wing
portion, in which a plurality of coupling grooves 412 are formed at
equal intervals in a circumferential direction thereof, may be
formed on the outer circumferential surface of the output shaft
410.
[0050] Coupling protrusions 432 extend downward from positions of a
lower surface of the inner gear 431 that correspond to the coupling
grooves 412. The coupling protrusions 432 may be inserted into the
coupling grooves 412. Thus, when the driving force generated in the
rotor core 310 is delivered to the inner gear 431 through the
hollow shaft 320, the output shaft 410 may be rotated more easily
according to the driving force of the hollow shaft 320 due to the
coupling protrusion 432 inserted into the coupling groove 412 of
the inner gear 431.
[0051] Meanwhile, among the inner gear 431 and the outer gear 433,
the inner gear 431 may be rotated together with the output shaft
410 by rotation of the hollow shaft 320, but the outer gear 433
should be fixed. Accordingly, the present disclosure may further
include a reducer cover 440. The reducer cover 440 supports the
outer gear 433, and the outer gear 433 may be assembled in a
press-fitting manner.
[0052] In particular, as shown in FIG. 5, a knurled surface may be
formed on a surface of the reducer cover 440, on which the outer
gear 433 is press-fitted. In other words, when the outer gear 433
is assembled in the press-fitting manner, the reducer cover 440 may
secure assembly robustness by a frictional force of the knurled
surface, whereby the outer gear 433 may be stably fixed to the
reducer cover 440. The knurled surface may be formed on the surface
of the reducer cover 440, but when assembly robustness of a
reduction gear and the outer gear 433 may be secured, according to
a use environment or a processing method, the knurled surface may
also be formed on the outer circumferential surface of the outer
gear 433 and may also be formed in any one of the reducer cover 440
or the outer gear 433.
[0053] As described above, in the electronic shift lever according
to the present disclosure, the plate portion 331 and the PCB 200
may be disposed adjacent to each other, and thus, the Hall sensor
210 attached to the PCB 200 may have a relatively high detection
power with respect to the sensor magnet 332 to more accurately
sense the sensor magnet 332. In addition, the sensor magnet 332
having low magnetism may be selectively used according to a use
environment to reduce costs of the sensor magnet 332. Since the
plate portion 331 may be formed to be thin, the housing 100 may be
formed to have a reduced size, thereby making the electronic shift
lever compact.
[0054] The present disclosure is not limited to the above-described
exemplary embodiments and various modifications may be made without
departing from the spirit and scope of the present disclosure.
* * * * *